Without thinking, I installed Windows 8 64-bit on my old PC from 7 years ago that initially ran Windows XP, and I upgraded it to Windows 7 32-bit when it came out. Now I've upgraded it to 64-bit since I upgraded my other computer.

I don't see why it should be a problem if the hardware supports it. The 64-bit version requires more RAM (I think 2GB whereas 32-bit only needs 1GB). Are you having any issues? If not then I don't see a problem.

Don't see why it would be bad as long as you've got drivers for everything and Windows is behaving. Personally I'd only really consider x86 for systems that obviously couldn't run x64 (old Athlon XP's, etc or have old hardware that doesn't have 64 bit drivers), or systems that only have like 2GB memory where 64 bit would probably do more harm than good due to the overhead.

Without thinking, I installed Windows 8 64-bit on my old PC from 7 years ago that initially ran Windows XP, and I upgraded it to Windows 7 32-bit when it came out. Now I've upgraded it to 64-bit since I upgraded my other computer.

Is this bad? Should I install 32-bit instead?

why??? old hardware, new windows = never a good deal. drivers missing, slow / poor performance... the list goes on.But hey, if you are happy with it.. i once installed Windows XP on my old trustee Pentium 200 MMX that came with Windows 95; sure it worked (upgraded everything on that puter except the board, PSU and CPU) but i could eat lunch or take a nap while the puter was booting still did lots of Photoshop work in that, though.

I don't see why it should be a problem if the hardware supports it. The 64-bit version requires more RAM (I think 2GB whereas 32-bit only needs 1GB). Are you having any issues? If not then I don't see a problem.

Unless you run XP, there is absolutely ZERO reason to run anything other than an x64 OS on hardware that will support it. (And even if you DO run XP, the support for x64 by XP-era hardware is a lot greater than you would think - the issue iwth XP64 and support is applications - not hardware.)

Look in the Hardware Hangout archives - I've made several posts covering migration from x32 to x64 over XP, Vista, and 7 - including my own migration (during the Vista era). The issue has by and large been applications-related, and especially since the release of Windows Vista - between that and just plain FUD, crossover was scarce during the Vista era.

Unless you run XP, there is absolutely ZERO reason to run anything other than an x64 OS on hardware that will support it. (And even if you DO run XP, the support for x64 by XP-era hardware is a lot greater than you would think - the issue iwth XP64 and support is applications - not hardware.)

There are plenty of reasons not to run 64-bit on old hardware. The biggest one being that 64-bit uses more resources and creates more processes. The OP having 1.5GB of RAM is going to be hurting himself in performance by running x64. And finding drivers will be a nightmare. Honestly, the only upside I can think of for him to run x64 would maybe be security. And even that's a stretch.

Plus, I think we first need to know the specific CPU he's running. There are very few single-core CPUs out there that support x64, so he might be mistaken in thinking a Pentium 4 or something supports it, when in reality it doesn't.

Unless you run XP, there is absolutely ZERO reason to run anything other than an x64 OS on hardware that will support it.

Maybe for home PCs, definitely not for office/corporate PCs. There's a huge amount of software, middleware, plugins, drivers, etc. that are specifically 32-bit. Getting this type of stuff to work in a 64-bit environment is often difficult or impossible, good luck trying justifying all the extra expenses to your boss/client. And frankly, most office PCs won't have more than 4 GB RAM.

But yeah, if all the software/hardware you're using is 64-bit compatible & you have 4+ GB RAM then it makes sense to go 64-bit.

Maybe for home PCs, definitely not for office/corporate PCs. There's a huge amount of software, middleware, plugins, drivers, etc. that are specifically 32-bit. Getting this type of stuff to work in a 64-bit environment is often difficult or impossible, good luck trying justifying all the extra expenses to your boss/client. And frankly, most office PCs won't have more than 4 GB RAM.

But yeah, if all the software/hardware you're using is 64-bit compatible & you have 4+ GB RAM then it makes sense to go 64-bit.

Again, you are referring to application issues - not hardware issues. (I specifically mentioned applications as being the bugbear with Windows in general, and XP in particular, in terms of migrating to x64 - I covered it in my posts covering migrating folks I support to x64 - starting with, in fact, XP64.) Further, NONE of my migratees had 4 GB of system RAM at the time of migration. None at all. (Over half had less than 2 GB of RAM - two had a mere 512MB of RAM. However, all of these were home users - not corporate or enterprise users. However, most were also using refurbished corporate or enterprise PCs - which shipped with either Windows XP Professional or even Windows 2000 Professional. Nearly the WORST of possible cases for an x64 migration; however, due to the lack of application issues with home users, I had far easier a time than would have been suspected.

The 4 GB issue - go back to Hardware Hangout and read my posts again. I started the migration trend because of - not in spite of - what I uncovered in my investigation of this particular rubric. My uncovering is, in fact, easily duplicated by anyone with access to virtualization software - simply configure identical virtual machines with each OS in the consideration pool. (Naturally, the host must support at least VT-X for both x32 and x64 to face off in this manner.) The virtualization software itself won't matter. Once the application and driver issues are addressed, the 4 GB floor is, in reality, half that. (It can be , in fact, lowered all the way down to a single gigabyte of RAM - or less - for computers used exclusively for Internet-based tasks - such as Web browsing and e-mail usage - that is exactly why smartphones, tablets, etc - which typically have memory loadouts of that size, or less - are eating PCs for lunch. It's also why I am FAR from surprised over slower sales of larger desktops.)

Just out of curiosity, what is your justification for installing XP 64-bit on a PC, especially if it had 2GB or less of RAM?A 64-bit word takes up twice as much memory as a 32-bit word, so with a small amount of RAM, it's a very very bad idea to go x64.